Measurement of the retinal venule (V) and arteriole (A) diameters. The black and red arrows indicate the borders of the venule and arteriole, respectively, where the hyper-reflective signal is seen. The white arrow represents the caliper used for retinal vessel diameter measurement.

Measurement of the retinal venule (V) and arteriole (A) diameters. The black and red arrows indicate the borders of the venule and arteriole, respectively, where the hyper-reflective signal is seen. The white arrow represents the caliper used for retinal vessel diameter measurement.